Many different options to buy music

It would be awesome if you could iplement this in your future release:
You could add "buy music" buttons next to the songs and then let's say a user presses the button, it will open up a small screen where you are able to compare many different internet music stores, like amazon and iTunes. Then it would be easy for the user to pick up the cheapest price of the song or album.
I think this would create music prize competition between different internet mucic stores and then the prices of the songs would probably come down pretty nicely...